Statistics Chapter 1- Test 1

32 cards

Statistics. Understandable Statistics


 
  
Created Sep 22, 2011
by
mandystanley

 

 
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1
A descriptive measure of a sample
 
statistic
2
method of organizing, summarizing, and presenting data
 
descriptive statistics
3
The group of all items of interest
 
population
4
the process of making an estimate. prediction, or decision about a population based on sample...
 
statistical inference
5
a set of data drawn from a population
 
sample
6
the data can be arranged in order & differences b/w data values are meaningful
 
interval scale
7
the data consists of names, labels, or categories. There are no criteria for ordering the data...
 
nominal scale
8
the data can be arranged in order & both & ratios b/w data values are meaningful. Also...
 
ratio scale
9
the data can be arranged in order. However, differences b/w data values either can;t be determined...
 
ordinal scale
10
The Requirements of a Random Sample
 
1. Each indiv. in population of interest must have an equal probability of being of being included...
11
Divide the entire population into pre-existing segments or clusters. The clusters are often...
 
Cluster sampling
12
Create a sample by using data from population members that are readily available.
 
Convenience Sampling
13
A simple random sample of n measurements from a population is a subset of the population...
 
Simple Random Sampling
14
Divide the entire population into distinct subgroups called strata. The strata are based on...
 
Stratified Sample
15
Number all members of the population sequentially. Then, from a starting point selected at...
 
Systematic sampling
16
A variable that describes an individual by placing the individual into a category or group,...
 
Qualitative variable
17
A quantitative variable has a value or numerical measurement for which operations such as addition...
 
Quantitative variable
18
numerical measure that describes an aspect of a population.
 
Parameter
19
Given a random sample of 9 skiers at Vail:18, 25, 32,16, 41, 52, 29, 58, 23Give the 5 number...
 
XMin= 16;  Q1= 20.5;  Med (Q2)= 29;  Q3= 46.5;  Xmax=58 Age of skiers
20
What is IQR and how do you find it?
 
Interquartile RangeQ3-Q1= 20.5
21
How do you find the sample mean?
 
Summation of X divided by n
22
How do you find the median?
 
Order the data and then find the physical middle; Position= (n+1)/2
23
How do you find the mode?
 
it is the most frequent
24
How to find Weighted Mean
 
Summation (Weight x Data) / Summation(Weight)
25
How do you find the Range?
 
Xmax - Xmin
26
How do you find the sample mean?
 
Summation(X) / n
27
How do you find the sample standard deviation?
 
fill in
28
Computational Formula (Standard Deviation)
 
fill in
29
Population Standard Deviation
 
fill in
30
Sample Variance
 
fill in
31
Population Variance
 
fill
32
Sample Mean for Grouped Data
 
fill


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